Area Code 434 – San Jose de Mayo

Geographic Overview

The +598 434 area code is a geographic National Destination Code (NDC) assigned to the city of San José de Mayo, the capital of the San José Department in southern Uruguay. This region is part of the country's southern interior, situated approximately 90 kilometers northwest of Montevideo. The code covers the urban and suburban areas of San José de Mayo and its immediate surroundings, serving both residential and business fixed-line subscribers.

Dialing Formats

For international callers, the complete number format is +598 434 X XXX, where the subscriber number typically consists of four to five digits following the area code. For example, a local number might be dialed as +598 4345 1234 from abroad. When calling within Uruguay from a different area code, you must dial the national trunk prefix 0 followed by the area code and subscriber number: 0 434 X XXX. However, local calls within San José de Mayo do not require the area code; simply dial the subscriber number directly.

Regulatory and Technical Notes

Uruguay's national numbering plan is administered by Unidad Reguladora de Servicios de Comunicaciones (URSEC), following ITU-T E.164 recommendations. The 434 code is classified as a geographic number, meaning it is tied to a physical location. This has implications for number portability: while fixed-line numbers can be ported between operators, the geographic association remains for routing and emergency services (e.g., 911).

In recent years, Uruguay has seen a steady migration from traditional PSTN to VoIP services. However, numbers under 434 are still primarily associated with fixed-line services, and operators must ensure that calls to these numbers are routed correctly regardless of the underlying technology. For businesses, having a local 434 number can enhance trust and local presence, especially when serving customers in the San José region.

When dialing from a mobile phone within Uruguay, the same trunk prefix rules apply. For international callers, it is essential to replace the leading zero (if present) with the country code +598. For example, a number written as 0 434 5678 would be dialed as +598 434 5678 from abroad.

As with all fixed-line numbers in Uruguay, calls to 434 numbers are typically charged at standard national rates, but international rates vary depending on the caller's carrier. For the most accurate and up-to-date information, always consult your service provider.